git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206625
91177308-0d34-0410-b5e6-
96231b3b80d8
// Assign the Latency field of SU using target-provided information.
SU->Latency = SchedModel.computeInstrLatency(SU->getInstr());
// Assign the Latency field of SU using target-provided information.
SU->Latency = SchedModel.computeInstrLatency(SU->getInstr());
- // If this SUnit uses an unbuffered resource, mark it as such.
- // These resources are used for in-order execution pipelines within an
- // out-of-order core and are identified by BufferSize=1. BufferSize=0 is
- // used for dispatch/issue groups and is not considered here.
+ // If this SUnit uses a reserved or unbuffered resource, mark it as such.
+ //
+ // Reserved resources block an instruction from issueing and stall the
+ // entire pipeline. These are identified by BufferSize=0.
+ //
+ // Unbuffered resources prevent execution of subsequeny instructions that
+ // require the same resources. This is used for in-order execution pipelines
+ // within an out-of-order core. These are identified by BufferSize=1.
if (SchedModel.hasInstrSchedModel()) {
const MCSchedClassDesc *SC = getSchedClass(SU);
for (TargetSchedModel::ProcResIter
if (SchedModel.hasInstrSchedModel()) {
const MCSchedClassDesc *SC = getSchedClass(SU);
for (TargetSchedModel::ProcResIter